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41
41: A later S-2 version of the Barber Stabilized truck,
still with a spring plank. The small springs bearing on
the friction wedges had been moved in so they were
behind the front row of main truck springs; note the
wedge pockets inside the bolster and the tops of the
wedges that are just visible between the bolster and
side frame.
spring plank (41), but a self-aligning spring-plankless S-2
quickly followed (42), as well as the 70 ton Barber S-3 (43).
The S-2 was so successful that it was licensed to other truck
manufacturers and, following World War II, became one of the
two most widely-used freight car trucks, the other being the
ASF A-3 (below). The Barber S-2 design was easily modified for
roller bearings, and as a roller bearing truck, it remains in pro-
duction today.
ASF A-3 Ride Control trucks
American Steel Foundries developed the ASF A-3 Ride Control
truck in the early 1940s, but before it could be placed on the
market World War II broke out, and the federal government
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